How to automatically click on button, every time I visit a web page

I have a web page that I visit regularly. There is a drop down menu, to select the mode of the page, the default I never use, I always select the 2nd option. I then almost always click the button that represents the event at the current time.

How can I configure my browser to do these clicks for me.

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What I am looking for is not a finished solution, but some advice as to whether selenium is the way to go.

Do I need an external language, or just the built in editor (I think that is a separate extension)?

Do/can I leave this server running while I am surfing, and it kicks in when I surf to the page?